Chain pipe-wrench.



G. AMBORN.

CHAIN PIPE WRENCH.

APPLICATION FILED FEB. 19, 1914.

Patented July 13, 1915.

2 SHEETS-SHEETI.

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G.AMBORN CHAIN P!PE WRENCH.

APPLICATION FILED FEB. 19. 1914.

1 146, 1 1 9., Patented July 13, 1915.

2 SHEETS-SHEET 2- INVENTOR WITNESSES:

. Ziy z4ltornqyg EC. if v GEORGE AIVIIBORN, OF CHAPINVILLE, CONNECTICUT, ASSIGNOR TO J. H. WILLIAMS &; 00., F BROOKLYN, NEW YORK, A CORPORATION. OF NEW YORK.

CHAIN PIPE-WRENCH.

Application filed February 19, 1914.

To all whom it may concern:

Be it known that I, GEORGE AMBORN, a citizen of the United States, residing at Chapinville, in the county of Litchfield and State of Connecticut, have invented certain new and useful Improvements in Chain Pipe-Wrenches, of which the following is a specification.

The present invention aims to provide certain improvements in chain pipe wrenches, especially wrenches of the double-jaw type shown in my prior Patents Nos. 876,927 of January 21, 1908, and 952,860 of March 22, 1910.

The invention aims especially to provide a wrench which is simple in construction, and in which the portion of the handle between the jaws can be wider and the swinging link and central stud or pin stronger than in previous wrenches, and in which the chain secures a more perfect grip upon pipes of the smaller sizes.

The accompanying drawings illustrate embodiments of the invention.

Figure l is a longitudinal vertical section between the two jaws, showing the chain in elevation; Fig. 2 is in part a plan and in part a longitudinal horizontal section; Fig. is in part an end elevation and in part a transverse vertical section through the wrench, omitting the chain; Fig. 41: is a View similar to Fig. 2, omitting the chain and showing a modified construction for the eentral pin; Fig. 5 is an inside face elevation of one of the jaws; Fig. 6 is a side elevation,

and Fig. 7 is a plan of the handle.

heferring to the embodiments of the invention illustrated, each of the aws A is of the usual double-ended type having at each end a set of toothed faces 13 B. Each jaw has also a central bore (j for the central pin l) which carries the swinging link E constituting the fixed end of the chain, and has at its opposite end bores F and F. When the working faces B are to be used, the handle is fastened by means of the central pin D passing through the central bore of each of the jaws, and by means of a pin or bolt G passing through the bore F in the rear end of each of the jaws. The handle H projects forward to a point beyond the central pin, as shown best in 1g. 1, its forward portion being divided into two prongs J and J between which the swinging link is accommodated. The portions of the prongs Specification of Letters Patent.

Patented July is, 1915.

Serial No. 819,657.

J J which extend forward beyond the pin D are cut away to form recesses such as K, F g. 1. The chain L is swung around the pipe M in the manner indicated, and the link N is locked in the manner hereinafter described, while the next link 0 is easily accommodated in the space provided by the recess K in the end of the handle. This is especially an advantage in the case of cable chains and permits the chain to extend in a straight line from the link N to the pipe so as to engage the maximum portion of the circumference of the latter.

For locking the free end of the chain, each of the jaws is provided on its inner face with a set of locks or hooks P P for use with one end of the jaw and identical locks P P for use with the other end.

In my previously patented constructions I have provided ledges on the inner faces of the jaws extending from a forward lock P to the corresponding rear lock P and constituting the common connecting base of the two locks and the floor of the space between these two looks, upon which the locked link N of the chain might rest; and the handle, being fastened between these ledges was thereby limited in width relatively to the width of the jaws. In the present construction these ledges are omitted the two locks are separate from each other at their bases and the handle piece is made wide enough to form the bottom or floor of the space between the locks in question, so that the link N rests directly upon the upper edge of the portion of the handle between the jaws. T he handle is thus considerably wider than in the previous constructions, and the pin D and link E are larger and stronger for jaws of the same width. The locks P and P are separated from each other by a considerable distance, and are correspondingly separated laterally from the central pin D. This gives a long bearing for the portion of the handle between the jaws, this bearing being on the inner horizontal faces of the locks P P. At the same time this spacing is suflicient to accommodate the entire length of the link N which is locked, and the space between the center of the jaw and the forward lock P, taken in connection with the shape of the portion of the handle which projects beyond the center, is sufficient to permit the next link 0 of the chain to swing freely and to lie in a tangent to quite a small pipe so as to embrace the latter to the fullest possible extent.

Fig. 4: shows a modified construction in which a central pin P of the usual size is provided surrounded by a bushing Q. This is especially useful where the jaws are made without the end holes F and F and the jaws are fastened together and to the handle by the central bolt only. The bushing serves as a spacer to hold the aws apart and prevent the bending of the prongs J J of the handle together by the strains of use or by screwing the jaws up too tight. The improved construction previously described by which a maximum width is secured for the portion of the handle between the jaws permits also the use of this bushing Q, while permitting the use of a bolt D of ample diameter.

Though I have described with great particularity of detail certain specific embodiments of the invention, yet it is not to be understood therefrom that the invention is restricted to the particular embodiments disclosed. Various modifications thereof in the details and arrangement of the parts may be made by those skilled in the art without departure from the invention.

I claim as my invention 1. A reversible aw chain pipe wrench having ahandle, a pair of double-ended reversible jaws, a central pin carrying a swinging link formingthe fast end of the chain and a pair of locks carried by each of the jaws at each side, said locks constituting ledges between which the handle is positioned and the two locks at either side of a jaw being separated at their bases so that the edge of the portion of the handle between the jaws is adapted to directly support a link engaged by said locks, whereby said portion of the handle ismade of maximum width.

2. A reversible jaw chain pipe wrench having a handle, a pair of double-ended reversible jaws, a central pin carrying a swinging link forming the fast end of the chain and a pair of locks carried by each of the jaws at each side, said locks constitut ing ledges between which the handle is po sitioned and the two locks at either side of a jaw being separated at their bases so that the edge of the portion of the handle between the jaws is adapted to directly su port a link engaged by said locks, whereby said portion of the handle is made of maximum width, and a bushing on said central pin extending between the inner faces of said jaws to limit the movement of said jaws toward each other.

3. A reversible jaw chain pipe wrench havinga handle, a pair of double-ended reversible aws, a central pin carrying a swinging tend in a straight line from the hooked link to pipes of small diameter.

4-. A reversible jaw chain pipe wrench having handle, a pair of double-ended I'GVGl SIblQ aws, a cable chain, a central pin carrying a swinging link forming the fast end of said chain, a pair of locks carried by each of the aws at each side and constituting ledges between which the handle is po sitioned so that the edge of the portion of the handle between the jaws is adapted to directly support in flat position a link engaged by said locks, said handle being fastened by said central pm and the portion of said hande projecting beyond said pin being shapedto permit the next link to swing down below the levelof the hooked link.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

GEORGE AMBORN.

Witnesses:

CHAS. B. HAnnis, JOHN B. PAYNE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

